The Nervous System is a complex System that has been broken into two major sections. One is the Central Nervous System also known as the CNS. This system consists of the brain and the Spinal cord. The second system is the Peripheral Nervous System which is known as the PNS. The PNS consist of all the other neural elements. The CNS and PNS work together to play a major role in the control of behavior. They receive and respond to the elements in the external and internal environment that’ll cause a nervous response.

The CNS represents the largest part of the nervous system. The complete CNS is in the dorsal cavity the brain sits in the cranial sub cavity which is protected by the skull and the spinal cord is in the spinal cavity that is protected by the vertebrae. The nerves in the spinal cord carry messages to and from the brain. This system is for information processing where the motor output is computed to the response of the sensory input. The brain receives messages through the CNS and the PNS through special neurons. Each message travels to the brain or the spinal cord. Messages received through the spinal cord causes a response to the stimuli (elements in the external and internal environment strong enough to cause a nervous reaction) that does not cause any interpretation. The stimuli that are then received in the brain causes the response. The response is generated through the sense organs that interact with the 5 senses (hearing, seeing, smelling, tasting and touching). There are also general senses that are associated with the 5 senses, they are: pressure sense (sensed by the pressure receptors beneath the skin), Temperature senses (for the hot and the cold. This sends messages through the nerves to the brain), touch senses (receptors called tactile corpuscles), and the sense of pain (this is a protectant against something being wrong) these receptors for the general senses are found in the skin, muscles, joints and the internal and...

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-We have 2 parts in our nervoussystem:
The central nervoussystem (CNS) is the nerves in our brain and spinal chord.
The peripheral nervoussystem (PNS) is a network of nerve cells in the rest of our body.
-Our nervoussystem detects stimuli and allows us to react to them.
-Stimulus: a change, action or occurrence in the environment that can cause an organism to respond. Eg....

...also helps with the activities in our lives such as remembering and making decisions and learning.
4. Give one example of a neurotransmitter? What is the purpose of this specific neurotransmitter? One example is acetylcholine. It is found in the nervoussystem and it sends messages relating to our skeletal muscles. Also, it helps with the capacity of memory capabilities.
5. Who are neuroscientists? They study the brain and behavior; they are guide in everything...

...and lower extremities then back to the center (heart) again.
I. CIRCULATORY SYSTEM
 the main transportation and cooling system of the body.
 responsible for transporting materials throughout the entire body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce.
 fluid distribution network
PARTS OF THE CIRCULATORY SYSTEM:
 The Heart, The Blood, and...

...﻿THE NERVOUS AND THE ENDOCRINE SYSTEM.
Humans need both the Nervous and the Endocrine systems basically because they do different things in different ways. They both have a co-ordination role and send instructions to other parts of the body. The nervoussystem does this by way of neurotransmitters,( chemical messengers), which are able to get messages through at very high speeds, and the endocrine...

...The NervousSystem: Membrane Potential
1.
Record the intracellular and extracellular concentrations of the following ions (mM/L):
Intracellular
Extracellular
Sodium (Na+)
Potassium (K+)
Chloride (Cl–)
2.
Excitable cells, like neurons, are more permeable to ___________ than to ___________.
3.
How would the following alterations affect the membrane permeability to K+?
Use arrows to indicate the change in permeability.
a. An increase in...

...Activity 25
DRAWINGS:
#1
#2
#3
Questions for research:
1. Organs in the major divisions of the nervoussystem….
2. Functions of the nervoussystem….
a. Neurons and synapses
Most neurons send signals via their axons, although some types are capable of dendrite-to-dendrite communication. (In fact, the types of neurons called amacrine cells have no axons, and communicate only via their dendrites.) Neural signals propagate...

...NervousSystem- Nerve Impulse
When a stimulus is strong enough, a nerve impulse is generated in an "all or none" response which means that a stimulus strong enough to generate a nerve impulse has been given. The stimulus triggers chemical and electrical changes in the neuron. Before an impulse is received, a resting neuron is polarized with different charges on either side of the cell membrane. The exterior of the cell is positively charged with a larger number...